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![[Post New]](/templates/default/images/icon_minipost_new.gif) 2 Apr 2008 17:18:23 IST
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case 1 : no. of ways of selecting al the 12 balls to b unique is (including one of the identical balls)
then no. ways = 17c12
if 2 identical balls r there then-16c10
if 3 identical balls r there then-16c9
if 4 identical balls r there then-16c8
if 5 identical balls r there then-16c7
if 6 identical balls r there then-16c6
if 7 identical balls r there then-16c5
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this reply: 5 points
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